I read that part too. Though, the thing is, it's A) speculation on her part and B) just because they didn't dress punk, it doesn't mean they weren't at the show. I go to punk shows. I don't look the part at all though.
You're definitely right, but saying that they where part of the punk community is speculation as well. With the information presented in the article we do not know if the attackers where part of the punk community, and therefore titles as "Transphobic violence in the punk community" or "Laura Jane Grace Talks with Fan About Transphobic Assault in the Punk Community" are misleading (as well as my own claim that it was an attack from outside the community). "Punk artist attacked by transphobic people" would have been a more honest title.